The species of Geranium show a wide range of flavonoid pattern, from one in which ail the regular (primitive) constituents are present to one where only quercetin and kaempferol are present. The primitive pattern predominates in the central Eurasian area, radiating eastward and westward from which the flavonoid constituents become progressivley impoverished. A “flavonoid score” providing a numerical estimate of this impoverishment is proposed. The results are presented and discussed in relation to Knuth's arrangement of the genus.
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E.C. Bate-Smith (1973) studied this question.
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